Alloy



75. METALLURGY.

Patented Aug. 25, 1925.

UNITED STATES PATENT OFFICE.

EMIL MAASS, OF BERLIN-HALENSEE. GERMANY, ASSIGNOR OF ONE-HALF TO MAR-BURG BROTHERS, INC.. OF NEW YORK, N. Y.. A CORPORATION OF NEJV YORK, ANDONE-HALF TO R. STOCK 8a (30., SPIR-ALBOl-IRER, WEEKZEUG-, 86MASGHINENFABRIK A. G., O'F BERLIN-MARIENFELDE, GERMANY, A CORPORATION OFGERMANY.

ALLOY.

No Drawing.

To all whom it may concern:

Be it known that I, EMIL MAAss. a citizen of Germany, residing atBerlin-Halensee. Germany, have invented certain new and usefulImprovements in Alloys, of which the following is a specification.

The invention relates generally to metallic alloys, and moreparticularly to an alloy composed chiefly of small quantities of c gpperu in um.

he ma iiiob'j ect of the iiive s to produce an alloy of the classreferred to, which shall he possessed of unusual tensile strength andcapable as well of resisting extraordi nary compression, besideswithstanding heavy shocks and sustained concussion.

In carrying out the invention, the best results are obtained bycompounding one hundred parts of zinc with about three parts of copperand approximately five parts of aluminum.

Slight variations in the respective proportions of the severalingredients employed in producing this alloy will not materially affectthe essential qualities thereof herein mentioned, but in practice it hasbeen found that, in order to gain these qualities, the quantity of thealuminum plus that of the copper must be over six per centum, but notmore than eight and five tenths per centum of the whole compound.

A peculiar feature of the invention. which may be inferred from theforegoing, is that even if the copper and the aluminum together areadded to the zinc according to the percentage above specified. theresulting alloy will exhibit its most desirable qualities only whencontaining a greater quantity of aluminum than of copper.

The alloy above described has a high tensile strength and offers greatresistance to heavy shocks, so that it can be used very advantageouslyin the manufacture of articles requiring these characteristics, such forinstance as bearings, bearing-bushings,

Serial No. 498,479.

compression rings or guide bands for pro jectiles. die-castings, and soforth. Among other advantages possessed by this alloy over alloys whichcontain a larger percentage of copper is that of greater cheapness, andalso of higher tensile strength combined with increased resistance undershock. Besides, it is softer and less brittle. Moreover, it is superiorto other alloys wherein the component parts are mixed in differentproportions. Another advantage of this new alloy resides in that itstensile strength, toughness, and ductility are susceptible of beingmaterially augmented by subjecting it to mechanical treatment, such aspressing, rolling. and the like.

The alloy described herein, furthermore, difiiers greatly from someother apparently similar alloys containing tin, for instance, which doesnot combine permanently with aluminum, the same forming always a poormixture, rapidly deteriorating .within a short time. whether stored orin use. On the contrary, the ingredients used in this new alloy, whenapportioned in the relative quantities and within the particular limitsset forth, form a permanent compound, which perpetually retains its goodqualities aforementioned.

Having now described my invention, what I claim, and desire to secure byLetters Patent of the United States, is

1. An alloy of the character described, consisting of one hundred partsof zinc a proximately three parts of m semi about five parts ofalgminum.

2. An alloy of tmai acter described, consisting of zinc, copper andaluminum, the combined amounts of copper and aluminum exceeding six percent but not more than eight and five tenths per cent of the whole, theindividual amounts of copper and aluminum, being respectivelyapproximately three per cent and five per cent of the Whole.

PROF. DR. EMIL MAASS. [n a]

